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Now that waitcmd no longer uses EXSIG we can remove it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This test program by Alexey Gladkov can cause dash to enter an
infinite loop in waitcmd.
#!/bin/dash
trap "echo TRAP" USR1
stub() {
echo ">>> STUB $1" >&2
sleep $1
echo "<<< STUB $1" >&2
kill -USR1 $$
}
stub 3 &
stub 2 &
until { echo "###"; wait; } do
echo "*** $?"
done
The problem is that if we get a signal after the wait3 system
call has returned but before we get to INTON in dowait, then
we can jump back up to the top and lose the exit status. So
if we then wait for the job that has just exited, then it'll
stay there forever.
I made the original change that caused this bug to fix pretty
much the same bug but in the opposite direction. That is, if
we get a signal after we enter wait3 but before we hit the kernel
then it too can cause the wait to go on forever (assuming the
child doesn't exit).
In fact this is pretty much exactly the scenario that you'll
find in glibc's documentation on pause(). The solution is given
there too, in the form of sigsuspend, which is the only way to
do the check and wait atomically.
So this patch fixes Alexey's race without reintroducing the old
bug by converting the blocking wait3 to a sigsuspend.
In order to do this we need to set a signal handler for SIGCHLD,
so the code has been modified to always do that.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The file arith_yacc.h was missing from dash_SOURCES causing it
to be excluded from the generated tar file.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Hi, Herbert and friends. I've created a small patch that allows dash
to be built on Mac OS X. I'm contributing it here with the hope that
it's suitable for inclusion in dash.
The changes in this patch are:
- __attribute__((__alias__())) is not supported, add an autoconf check
- open64 is not present although the stat64 family is, separate the
autoconf checks
- A syntax error had slipped into a non-glibc codepath
- mkbuiltins had a nonportable mktemp invocation for the case where
tempfile is not availalble
Nothing in this patch is actually Mac OS X-specific, so it might aid
portability to other platforms as well.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Hi, I propose to apply the following patch for dash. The problem is
alloca.h is absent on many platforms including NetBSD I'm running.
Also, NetBSD's version of mktemp doesn't work without temporary
filename pattern.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Sven Mascheck reported that we no longer accept the non-standard
for {} syntax but the manual page still refers to it. This patch
removes that reference.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Sat, Aug 02, 2008 at 01:24:16AM +0200, Peter Hartlich wrote:
>
> dash's debian/diff/0048--CD-Restored-warning-when-getcwd-fails.diff
> contains the following lines:
>
> - return getcwd(buf, sizeof(buf)) ? savestr(buf) : nullstr;
> +
> + if (getcwd(buf, sizeof(buf))
> + return savestr(buf);
>
> The if condition is missing a closing parenthesis, which probably went
> unnoticed because it occurs in a section only compiled if __GLIBC__ is
> not defined.
This patch adds the extra parenthesis. Thanks Peter.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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In section Redirection the following text misses a left brace:
where redir-op is one of the redirection operators mentioned previously.
Following is a list of the possible redirections. The [n] is an optional
number, as in \u20183\u2019 (not \u2018[3]\u2019, that refers to a file descriptor.
Reported by Jörg Sommer through
http://bugs.debian.org/481365
Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds support for the -l option (login shell) as required
by the LSB.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Per POSIX ENV needs to undergo parameter expansion.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This function is no longer used anywhere else.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The previous two changes were broken because t_lex uses global state.
This patch removes that by making t_wp local to t_lex.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Making these functions non-recursive is straightforward since they
carry no state.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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----- Forwarded message from Gerrit Pape <pape@smarden.org> -----
Subject: Bug#455828: dash: 4-argument test "test \( ! -e \)" yields an error
Date: Fri, 28 Dec 2007 08:53:29 +0000
From: Gerrit Pape <pape@smarden.org>
To: Vincent Lefevre <vincent@vinc17.org>, 455828@bugs.debian.org
On Thu, Dec 27, 2007 at 06:23:20PM +0100, Vincent Lefevre wrote:
> On 2007-12-27 16:00:06 +0000, Gerrit Pape wrote:
> > On Wed, Dec 12, 2007 at 02:18:47AM +0100, Vincent Lefevre wrote:
> > > According to POSIX[*], "test \( ! -e \)" is a 4-argument test and is
> > > here equivalent to "test ! -e". But dash (like ksh93 and bash) yields
> > > an error:
> > >
> > > $ test \( ! -e \) || echo $?
> > > test: 1: closing paren expected
> > > 2
> > > $ test ! -e || echo $?
> > > 1
> >
> > Hi Vincent,
> >
> > the -e switch to test takes an argument, a pathname.
>
> According to POSIX, in both above examples, "-e" is *not* a switch,
> just a string.
>
> test \( ! -e \)
>
> means: return true if the string "-e" is empty, otherwhise return false.
> The error in dash is that it incorrectly thinks that "-e" is a switch in
> this context.
I see, you're right. Thanks, Gerrit.
----- End forwarded message -----
This patch hard-codes the 3,4-argument cases in the way required by
POSIX.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Back in January an attempt was made to fix the interpretation of
quoted slashes in expmeta. However, this only fixed those cases
where the quoted slash is at the front of the word. The case of
non-leading slashes caused the previous directory part to gain a
back slash suffix which causes subsequent pattern matches to fail.
This patch fixes this by removing the back slash in that case.
Thanks to Romain Tartière fox reporting this bug.
Test case:
echo /*"/null"
Old result:
/*/null
New result:
/dev/null
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The parser used to skip a byte when parsing the & and | operators, testcase:
$ dash -c 'echo $((7&1))'
$ dash -c 'echo $((7& 1))'
$ dash -c 'echo $((7&11))'
Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This gitignore covers most of the generated files in the src/ directory.
Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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gcc generates bogus warnings about uninitialised variables in parser.c.
This patch borrows the uninitialized_var macro from Linux to silence
them.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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klibc does not have mempcpy, so system.h must be included where this is used
to provide the replacement. glob.h doesn't exist, so we need to guard this
include with the HAVE_GLOB definition. Finally, klcc didn't like the syntax
of the main definition in mksignames, and the resulting program segfaulted
when trying to dereference any part of the argv array. Updating the main
function definition solved the problem.
Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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As it stands if we get an error before procargs gets called by main()
we'll try to print out a null pointer. This patch avoids this by
printing out "sh" instead.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Somewhere along the lines the warning when getcwd fails went missing.
This patch restores it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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AC_GNU_SOURCE always defines _GNU_SOURCE so testing it is pointless.
This patch changes it to test __GLIBC__ instead.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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With klcc we get
klcc -DHAVE_CONFIG_H -I. -I.. -include ../config.h -DBSD=1 -DSHELL
-DIFS_BROKEN -Wall -D__CTYPE_NO_INLINE -MT exec.o -MD -MP -MF
.deps/exec.Tpo -c -o exec.o exec.c
exec.c: In function 'tryexec':
exec.c:160: warning: comparison with string literal results in unspecified behavior
Storing it in a local variable fixes the problem.
Thanks to Dan McGee for reporting this.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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These days dash is expected to build with libraries other than
glibc so we need to support the old way of calling getcwd again.
Thanks to Dan McGee for reporting this bug when dash is built with
klibc.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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(Herbert: for context, see
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=467065 )
This is a real bug in upstream dash, which has existed since at
least dash-0.5.1 (July 2004). It is a latent bug in cmdtxt()
(which I think applies only to pipes) as it handles "if" commands.
The attached patch fixes it for me.
It's possible this patch will fix one or more of #462414,
#462977, and #463649. I'll send messages there to see if
the submitters can test.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The change
[EXPAND] Do not quote back slashes in parameter expansions outside quotes
triggered a latent bug in expmeta where the forward slashes when preceded
by a blackslash weren't recognised as directory separators. This was hidden
because a work-around was put in place for glob(3) which meant that we never
had any backslashes immediately before forward slashes.
This patch fixes the metaflag loop to recognise forward slashes even when
they follow a backslash.
Thanks to Daniel Hahler for reporting this problem.
Test case:
echo "/"root*
Old result:
/root*
New result:
/root
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Once I fixed the previous problem it became apparent that we never dealt
with prompts with new-lines in them correctly. The problem is that we
showed a secondary prompt for each of them.
This patch disables prompt generation in expandstr.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Previously expandstr used the string "" to indicate that it needs to be
treated just like a here-doc except that there is no terminator. However,
the string "" is in fact a valid here-doc terminator so now that we deal
with it correctly expandstr no longer works in the presence of new-lines
in the prompt.
This patch introduces the FAKEEOFMARK macro which does not equal any
real EOF marker but is distinct from the NULL pointer which is used to
indicate non-here-doc contexts.
Thanks to Markus Triska for reporting this regression.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Although in posix, imaxdiv() isn't implemented on Debian/alpha, causing
dash to fail to build. So use / and % operators if imaxdiv() isn't
available.
http://bugs.debian.org/456398
Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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The dash(1) in Debian stable does not support "set +o" in the manner
specified by SUSv3:
|+o
| Write the current option settings to standard output in a format
| that is suitable for reinput to the shell as commands that
| achieve the same options settings.
(citation from
http://www.opengroup.org/onlinepubs/009695399/utilities/set.html)
Instead, dash's "set +o" prints the shell's options in a
human-readable format.
Here is a simple test program that exercises this feature; it works as
I believe is required under bash, but not under dash.
# Save the shell's options
set +o > /tmp/settings-commands
set -o | sort > /tmp/settings-before
# Change some options.
set -v
set -f
set -x
set +o emacs
set -o vi
# Try to restore our options.
. /tmp/settings-commands
set -o | sort > /tmp/settings-after
# Compare.
diff /tmp/settings-before /tmp/settings-after
I believe the following small patch adds this feature to dash, and
documents it in the manual page:
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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dash dies on sparc with a SIGBUS due to an arithmetic error introduced
with commit 03b4958, this patch fixes it.
---
> Hi Gerrit,
>
> dash 0.5.4-3 dies on sparc with a SIGBUS due to an arithmetic error
> introduced with the patch
> 0030-EXEC-Fixed-execing-of-scripts-with-no-hash-bang.diff. The
> attached
> patch fixes the problem.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Previously we always expanded here-documents in a subshell. This is
contrary to the POSIX specification and how other shells behave. What's
more this slows down many expansions due to the extra fork (however, it
must be said that it is possible for it speed up certain expansions by
running it simultaneously with the command on two CPUs).
This patch move the expansion into the current shell environment.
Test case:
unset a
cat <<- EOF > /dev/null
${a=NOT}
EOF
echo ${a}BAD
Old result:
BAD
New result:
NOTBAD
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The herefd hack goes back more than a decade. it limits the amount of
memory we have to allocate when expanding here-documents by writing the
result out from time to time. However, it's no longer safe because the
stack is used to place intermediate results too and there we certainly
don't want to write them out should we be short on memory.
In any case, with today's computers we can afford to keep the entire
result in memory and write them out at the end.
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On Tue, Oct 30, 2007 at 04:23:35AM +0000, Oleg Verych wrote:
>
> } 8<<""
> ======================
Actually this (the empty delim) only works with dash by accident.
I've tried bash and pdksh and they both terminate on the first
empty line which is what you would expect rather than EOF. The
real Korn shell does something completely different.
I've fixed this in dash to conform to bash/pdksh.
> In [0] it's stated, that delimiter isn't evaluated (expanded), only
> quoiting must be checked. That if() seems to be completely bogus.
OK I agree. The reason it was there is because the parser would
have already replaced the dollar sign by an internal representation.
I've fixed it properly with this patch.
Test case:
cat <<- $a
OK
$a
cat <<- ""
OK
echo OK
Old result:
dash: Syntax error: Illegal eof marker for << redirection
OK
echo OK
New result:
OK
OK
OK
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The change
[PARSER] Recognise here-doc delimiters terminated by EOF
introduced a regerssion whereby lines starting with eofmark but are not equal
to eofmark would be corrupted. This patch fixes it.
Test case:
cat << _ACEOF
_ASBOX
_ACEOF
Old result:
SASBOX
New result:
_ASBOX
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Debian's libc6 as of 2.6.1-6 has working glob(3)/fnmatch(3) support.
This patch adds the options --enable-glob and --enable-fnmatch to
the configure script. By default glob(3) and fnmatch(3) are still
unused. However, on distros where the glibc is known to work you
may enable these options.
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This patch adds the badnum function and uses it to mostly replace the use
of illnum except in miscbltin where the current code turns out to be smaller
because of the twin sh_error calls.
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* NULL as a number argument:
olecom@deen:/mnt/debian/src/dash-0.5.3$ time src/dash tst-01.sh
test: 20: `': bad number
`' eq 0: 2 must be >1, Not A Number
test: 20: `': bad number
`' ne 0: 2 must be >1, Not A Number
test: 20: `': bad number
`' gt 0: 2 must be >1, Not A Number
test: 20: `': bad number
`' ge 0: 2 must be >1, Not A Number
test: 20: `': bad number
`' lt 0: 2 must be >1, Not A Number
test: 20: `': bad number
`' le 0: 2 must be >1, Not A Number
/usr/bin/test: invalid integer `'
`' eq 0: 2 must be >1, Not A Number
/usr/bin/test: invalid integer `'
`' ne 0: 2 must be >1, Not A Number
/usr/bin/test: invalid integer `'
`' gt 0: 2 must be >1, Not A Number
/usr/bin/test: invalid integer `'
`' ge 0: 2 must be >1, Not A Number
/usr/bin/test: invalid integer `'
`' lt 0: 2 must be >1, Not A Number
/usr/bin/test: invalid integer `'
`' le 0: 2 must be >1, Not A Number
#!/usr/bin/printf This not executable script%c\n
test_arithm() {
for aop in eq ne gt ge lt le
do "$1" 0 -$aop "$NOTHING"
echo "\`' $aop 0:" $? " must be >1, Not A Number"
done
}
# opengroup.org/onlinepubs/000095399/utilites/test.html (nothing about long):
test_arithm test
test_arithm /usr/bin/test
# shend
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The function tryexec used the original name instead of the path found through
PATH search. This patch fixes that.
Test case:
trap 'rm -f $TMP' EXIT
TMP=$(tempfile -s nosuchthing)
cat <<- EOF > $TMP
echo OK
EOF
chmod u+x $TMP
cd /
PATH=${TMP%/*} ${TMP##*/}
Old result:
/bin/sh: Can't open filelgY4Fanosuchthing
New result:
OK
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This patch adds a flag argument to setvarint and uses it to set the OPTIND
variable.
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The case where the expansion isn't quoted is the norm.
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Use += instead of straight assignment for token value.
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This patch adds assignment operator support in arithmetic expansions. It
also changes the type used to intmax_t.
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On Wed, Apr 11, 2007 at 01:24:21PM -0700, Micah Cowan wrote:
> Package: dash
> Version: 0.5.3-3
>
> Bug first reported against Ubuntu at
> https://bugs.launchpad.net/ubuntu/+source/dash/+bug/105634
> by Paul Smith
>
> The description and some comments from that bug report follow.
>
> -----
>
> This operation fails on Ubuntu:
>
> $ /bin/sh -c 'if false; then d="${foo/bar}"; fi'
> /bin/sh: Syntax error: Bad substitution
>
> When used with other POSIX shells it succeeds. While semantically the
> variable reference ${foo/bar} is not valid, this is not a syntax error
> according to POSIX, and since the variable assignment expression is
> never invoked (because it's within an "if false") it should not be seen
> as an error.
>
> I ran into this because after restarting my system I could no longer log
> in. It turns out that the problem was (a) I had edited .gnomerc to
> source my .bashrc file so that my environment would be set properly, and
> (b) I had added some new code to my .bashrc WITHIN A CHECK FOR BASH!
> that used bash's ${var/match/sub} feature. Even though this code was
> within a "case $BASH_VERSION; in *[0-9]*) ... esac (so dash would never
> execute it since that variable is not set), it still caused dash to
> throw up.
>
> -----
>
> FYI, some relevant details from POSIX:
>
> Section 2.3, Token Recognition:
>
> 5. If the current character is an unquoted '$' or '`', the shell shall
> identify the start of any candidates for parameter expansion ( Parameter
> Expansion), command substitution ( Command Substitution), or arithmetic
> expansion ( Arithmetic Expansion) from their introductory unquoted
> character sequences: '$' or "${", "$(" or '`', and "$((", respectively.
> The shell shall read sufficient input to determine the end of the unit
> to be expanded (as explained in the cited sections).
>
> Section 2.6.2, Parameter Expansion:
>
> The format for parameter expansion is as follows:
>
> ${expression}
>
> where expression consists of all characters until the matching '}'. Any
> '}' escaped by a backslash or within a quoted string, and characters in
> embedded arithmetic expansions, command substitutions, and variable
> expansions, shall not be examined in determining the matching '}'.
>
> [...]
>
> The parameter name or symbol can be enclosed in braces, which are
> optional except for positional parameters with more than one digit or
> when parameter is followed by a character that could be interpreted as
> part of the name. The matching closing brace shall be determined by
> counting brace levels, skipping over enclosed quoted strings, and
> command substitutions.
>
> ---
>
> In addition to bash I've checked Solaris /bin/sh and ksh and they don't
> report an error.
>
> -----
> Micah Cowan:
>
> The applicable portion of POSIX is in XCU 2.10.1:
>
> "The WORD tokens shall have the word expansion rules applied to them
> immediately before the associated command is executed, not at the time
> the command is parsed."
>
> This seems fairly clear to me.
This patch moves the error detection to expansion time.
Test case:
if false; then
echo ${a!7}
fi
echo OK
Old result:
dash: Syntax error: Bad substitution
New result:
OK
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This patch adds the function atomax10 and uses it in test(1) so that we
support intmax_t comparisons.
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The only user of setvarsafe is getopts. However, we can achieve the same
result by pre-setting the value of shellparam.optind.
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Previously setting OPTIND to 0 would cause subsequent getopts calls to fail.
This patch makes dash reset the getopts parameters the same way as OPTIND=1.
Both behaviours are allowed by POSIX but other common shells do tolerate this
case.
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This patch gets rid of the stack mark tracking hack by allocating a little
bit of stack memory if we're at risk of planting a stack mark which may be
grown later. To do this a new function pushstackmark is added which lets
the user pick a bigger amount to allocate since some users do that anyway
after setting a stack mark.
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